Lewis belongs to the group of Demons called the Poachers. It is also later revealed that he serves as a purveyor for the Grand Valley orphanage who delivers the children to Goldy Pond.
Lewis was born into the Royal family. 1000 years ago, before the farms' establishment and the creation of the "Promise", Lewis was seen to slaughter hundreds of humans seeking to end the war between the two races.
In the turmoil of the capital, the remaining vassals of the Five Regent Houses fell under the command of Peter Ratri who ordered them to arrest all those that had been cured of the poison by the cattle children. Mujika and Sonju were captured as well and labeled as traitors who instigated the events. When they were about to be executed, Lewis made his appearance known. The crowd was in shock at the Grand Duke's return as he had been thought dead. Seeing the situation he demanded what was going on, and was annoyed that the lapdogs of the Five Regents were giving orders. Turning his attention to the prisoners he greeted his younger brother, before slashing him across the chest. Gathering the blood ins a goblet he drank the so-called evil blood to the shock of the audience. The Grand Duke revealed that the Evil Blood Clan was a ruse created by his sister and the Five Regent Houses. He explained that the blood was a miracle that allowed demons to be free from the need to consume human flesh and how that the people were victims of the Royal Family and their vassals as they kept the information for themselves. He called for an end to the execution, proclaiming his brother and Mujika heroes and order the elimination of the remaining vassals and current government.
Lewis is the younger brother of Queen Legravalima and the older brother of Sonju, as well as a part of the Royal Family in the Demon World.
(Source: Yakusoku no Neverland Wiki)
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